Nisar Farah, Hameed Abdul, Gul Bilquees, Aziz Irfan, Nielsen Brent L
Dr. Muhammad Ajmal Khan Institute of Sustainable Halophyte Utilization (MAK-ISHU), University of Karachi, Karachi, Pakistan.
Faculty of Arts and Sciences, Aga Khan University, Karachi, Pakistan.
Front Plant Sci. 2024 Dec 20;15:1504540. doi: 10.3389/fpls.2024.1504540. eCollection 2024.
Little is known about the similarities and differences in responses of plants grown from heteromorphic seeds, which are morpho-physiologically dissimilar seeds produced simultaneously on the same plant.
In this context, we studied how plants grown from heteromorphic (i.e. black and brown) seeds of the succulent halophyte respond to increasing salt levels during growth by modulating their physio-chemical processes.
Plants germinated from both black and brown seeds did not show any significant growth reduction and chlorophyll a content decline at moderate salinity (300 mM NaCl) compared to non-saline controls. High salinity (900 mM NaCl), on the other hand, caused decreased growth and sap Ψ in plants derived from either seed type. In plants emerged from brown but not black seeds, high salinity increased the activity of all H2O2-detoxifying antioxidant enzymes as well as GSH level. Under conditions of high salinity, plants obtained from both types of seeds exhibited signs of lipid peroxidation in the form of elevated malondialdehyde levels.
Our findings thus point to metabolic variability in plants growing from heteromorphic seeds under salt stress.
对于从异形种子生长而来的植物的反应异同了解甚少，异形种子是指在同一植株上同时产生的形态生理上不同的种子。
在此背景下，我们研究了肉质盐生植物的异形（即黑色和棕色）种子所生长出的植物在生长过程中如何通过调节其物理化学过程来应对盐浓度的增加。
与非盐对照相比，由黑色和棕色种子萌发的植物在中度盐度（300 mM NaCl）下均未表现出任何显著的生长减缓以及叶绿素a含量下降。另一方面，高盐度（900 mM NaCl）导致两种种子类型的植物生长和汁液水势降低。在由棕色而非黑色种子萌发的植物中，高盐度增加了所有H2O2解毒抗氧化酶的活性以及谷胱甘肽水平。在高盐度条件下，两种种子类型的植物均表现出脂质过氧化迹象，以丙二醛水平升高的形式呈现。
因此，我们的研究结果表明在盐胁迫下从异形种子生长而来的植物存在代谢变异性。
